12 Unhealthy Fish You Should Avoid

By Emily Main for Prevention

Our oceans have become so depleted of wild fish stocks, and so polluted with industrial contaminants, that trying to figure out the fish that are both safe and sustainable can make your head spin. "Good fish" lists can change year after year, because stocks rebound or get depleted every few years, but there are some fish that, no matter what, you can always decline.

The nonprofit Food & Water Watch looked at all the varieties of fish out there, how they were harvested, how certain species are farmed and levels of toxic contaminants like mercury or PCBs in the fish, as well as how heavily local fishermen relied upon fisheries for their economic survival.

Here are six of the fish they determined we should avoid, no matter what. Then head over to Prevention for the full list.

More from Prevention:
7 Steps to a Longer Life
4 Surprising Coffee Cures
8 Foods That Pack Disease-Fighting Power